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If I were you, Oliver, I would save up for a little bit longer and then purchase an 8" dob. You will be getting a scope that is very portable and has the image resolution and light gathering capacity to keep you and your brother quite happy for a very long time.
As Mike has been trying to explain to you, magnification is not the be all and end all of a telescope. I can tell you from lots of experience that you will hardly ever get to use your scope (no matter what it is) at the highest magnifications that it can render an object at. For the most part, the sky just won't allow you to because of clouds or wind or bright lights from the city. Then you have the Moon and all that skyglow. You have to be very lucky to get the right conditions to be able to use the very high magnifications on your scope. Most of the time, you'll be using the low and medium power eyepieces, and in any case these eyepieces give you the better views of what you're looking at, anyway.
So, forget about the magnification, and concentrate on how big a mirror or lens your scope has, and what sort of mount you want for it. As I suggested, a good start off point is an 8" scope. It's small enough to be easily handled, yet has the capacity to show you a lot of objects that smaller scopes can't reach. You'll get to see far more in an 8" than you could possibly believe and it will be some time before you want anything bigger.
Once you've bought your scope, then you have to decide upon eyepieces, and dare I say, filters for viewing through the scope. When you come to that point, just post a thread in the beginners forum and we will advise you on what you will need.
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